Inventory of Western Screech-Owl
in the Thompson Region
by
Greg Ferguson and Francis Iredale
British Columbia Conservation Corps
Submitted to the
British Columbia Conservation Foundation and
British Columbia Ministry of Environment
September 2007
ii
ABSTRACT
Two hundred and thirty one acoustic call-playback occupancy surveys were conducted over a 24
day period during the summer of 2007 to document the occurrence and distribution of the
macfarlanei subspecies of Western Screech-Owl (Megascops kennicottii) in the Thompson
Region of British Columbia (B.C.).
Three adult Western Screech-Owls were detected during surveys in 2007. Two of these
detections were of new owls found along the Coldwater River and Criss Creek and one was a re-
detection of an owl found along the upper Deadman River in 2006. Of three previous owl
detections made in the Thompson Region during 2006 and the spring of 2007, none were re-
detected during surveys. Possible reasons for the lack of re-detection of these Western Screech-
Owls may have been due to the owls moving to another area outside the radius of our calling
stations or a lack of response to call-playbacks during the time of survey. Four additional owl
species were heard or seen during surveys. During surveys the authors noted two riparian areas
containing deciduous forest that had been burned.
The authors recommend that more detailed surveys be carried out in the upper Deadman River
to assess the breeding status of the Western Screech-Owl detected in this area four times over a
two year period. Additionally, areas containing Western Screech-Owls detected in 2006 should
be resurveyed more than once during the breeding season to greater assess their status.
Given a detection rate of only 1.3% was achieved during call-playback surveys for the
macfarlanei subspecies of Western Screech-Owl in 2007, this further lends evidence to the
rarity of this species in the Thompson Region.
iii
ACKNOWLEDGEMENTS
The authors thank the B.C. Ministry of Environment, B.C. Conservation Foundation and B.C.
Conservation Corps program for providing logistical and supervisory support for this project.
Many thanks to Nigel Jackett for happily assisting with surveys during the latter portion of the
season and with reviewing earlier drafts. Special thanks to John Surgenor, Wildlife Biologist
with the B.C. Ministry of Environment, for his time and assistance in planning field work.
Funding for this project was provided by the B.C. Ministry of Environment through the B.C.
Conservation Corps program.
iv
TABLE OF CONTENTS
1 INTRODUCTION .……….……………………………………………………………. 1
2 PROJECT AND STUDY AREA …………….………………………………………… 2
3 METHODS ...…………………………………………………………………………… 3
4 RESULTS ………………………………………………………………………………. 4
4.1 Survey Effort ……………………………………....……………………………… 4
4.2 New Detections and Resightings of Western Screech-Owls …………………….. 5
4.3 Other Owl Species Detections and Observations …………………………………. 8
5 DISCUSSION …………………………………………………………………………... 8
6 RECOMMENDATIONS ……………………………………………………………….. 9
7 LITERATURE CITED .………………………………………………………………… 10
LIST OF FIGURES
Figure 1. Approximate distribution of Western Screech-Owl macfarlanei subspecies
in Canada ……………………………………………………………………... 2
Figure 2. Overview of Thompson Region, B.C. Ministry of Environment …………….. 3
Figure 3. Locations of 2007 call-playback survey stations in the Thompson Region,
B.C. …………………………………………………..……………………….. 5
Figure 4. Locations of 2007 Western Screech-Owl detections in the Thompson
Region, B.C. …….………………………………………………..................... 6
Figure 5. Habitat along lower Criss Creek where Western Screech-Owl detection
was made ……………………………………………………………………... 7
Figure 6. Habitat along upper Coldwater River where Western Screech-Owl detection
was made ……………………………………………………………………... 7
Figure 7. Burned deciduous riparian forest habitat along Highway 99 ……………….... 8
LIST OF APPENDICIES
Appendix 1. Acoustic call-playback owl survey data form ………………………..……….. 11
Appendix 2. Acoustic call-playback owl detection data form ………………...……………. 12
Appendix 3. Western Screech-Owl detections in the Thompson Region, B.C. …………….. 13
Appendix 4. Detection of other owl species in the Thompson Region, B.C. ……………….. 13
1
1 INTRODUCTION
The macfarlanei subspecies of Western Screech-Owl (Megascops kennicottii) is a rare to
uncommon local resident in the central-southern interior of British Columbia (B.C.) (Campbell
et al. 1990) (Figure 1). This subspecies occurs within the Bunchgrass, Ponderosa Pine, Interior
Douglas-fir and Interior Cedar-Hemlock biogeoclimatic zones (B.C. Conservation Data Centre
2007). In the interior, most birds are found in deciduous woodlands along lakeshores and
streams (Campbell et al. 1990). The macfarlanei subspecies is designated as Endangered in
Canada by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC 2002), is
on the provincial Red list in B.C. (Government of B.C. 2007a) and is listed in the Province’s
Identified Wildlife Management Strategy (IWMS) under the Forest and Range Practices Act as
of May 2004 (B.C. Conservation Data Centre 2007).
A threat to the macfarlanei subspecies in the interior of B.C. is the loss of preferred habitat, such
as low elevation deciduous forests and riparian areas, through urban development and
agriculture demands (Cannings et al. 1987). An increase in the loss of old, large diameter trees
used for nesting, as a result of single tree felling or land clearing for development and forestry is
also a potential threat (COSEWIC 2002).
Given the status and lack of information on the distribution and abundance of Western Screech-
Owls in the Thompson Region of B.C., the B.C. Ministry of Environment (MOE) hired Francis
Iredale (B.Sc.) and Greg Ferguson (B.Sc.) as B.C. Conservation Corps (BCCC) employees in
2007 to conduct acoustic call-playback occupancy surveys for Western Screech-Owl in selected
habitats within the Thompson Region. The goals of this project were to further determine the
distribution of the Western Screech-Owl in the Thompson Region through locating new
occurrences and to re-assess the occupancy of habitat where previous detections have been
made for monitoring purposes. This was accomplished through the performance of acoustic call-
playback occupancy surveys in areas of suitable habitat that were not surveyed in 2006 by
BCCC employees, by re-checking detections of Western Screech-Owls made in 2006 and
through the checking of new incidental detections. New Western Screech-Owl occurrences in
the Thompson Region will be submitted to the MOE as candidate Wildlife Habitat Areas for
inclusion under the IWMS.
2
Figure 1. Approximate distribution of Western Screech-Owl macfarlanei subspecies in Canada
(Canadian Wildlife Service 2004).
2 PROJECT AND STUDY AREA
In its second field season, this project is part of a larger effort to assess the occurrence and
distribution of Western Screech-Owl in B.C. In addition to works being conducted in the
Thompson Region, BCCC employees and MOE staff are also documenting the occurrence and
distribution of Western Screech-Owl in the Okanagan Region in 2007.
Surveying for Western Screech-Owl in 2007 was conducted in the Thompson Region, B.C.
(Figure 2). This region is situated within the southern interior of B.C. and encompasses suitable
habitat for Western Screech-Owl, such as deciduous forests and riparian areas composed of
mature black cottonwood for nesting, dense shrubs for foraging and cover, and a surrounding
soft edge of native grassland or coniferous forest. The majority of surveys were conducted in
valley bottoms along major or minor rivers and streams that contained mature deciduous forest
with moderate to abundant shrub cover.
3
Figure 2. Overview of Thompson Region, B.C. Ministry of Environment (Government of B.C.
2007b).
3 METHODS
A strategic sampling design using optimal habitat stratification was used in 2007 to survey for
Western Screech-Owl in the Thompson Region. A habitat suitability map delineating the
presence of mature trembling aspen (Populus tremuloides) and black cottonwood (Populus
balsamifera ssp. trichocarpa) within the Thompson Region, in addition to survey stations from
2006, was produced using Arcview 9.0 prior to the commencement of field work (Iredale 2007).
Locations of previous Western Screech-Owl detections were noted for re-checking and gaps in
suitable habitat not surveyed in 2006 were identified and mapped at a larger scale to guide
survey efforts.
Surveys were started after the end of March, as Western Screech-Owls in the interior are known
to begin hooting in early March (Campbell et al. 1990). Timing of surveys was sporadic
throughout the summer, due to inventory commitments for other species at risk.
A coarse filter approach was used to select broad areas of suitable Western Screech-Owl habitat
for targeting survey efforts. Areas were selected based on habitat suitability model results, gaps
in survey efforts during 2006 and requirements to re-assess a sub-sample of former detections.
Once these areas were selected, a finer filter approach was used to select specific sampling
stations. This involved driving through these broader areas and establishing call-playback
4
stations at sites where nesting, foraging and cover habitat was deemed most suitable for Western
Screech-Owl occurrence. Features used to assess the suitability of sites for call-playback
stations included the presence and abundance of mature black cottonwood or other mature
deciduous trees, the density of shrubs, the presence of a soft edge and water, and the elevation of
the site. Sites at lower elevations with large amounts of continuous mature deciduous forest,
abundant shrubs, a surrounding soft edge and water were deemed optimal for establishing
stations.
Acoustic call-playback occupancy surveys were used to detect Western Screech-Owls following
protocols developed for the Resources Information Standards Committee of B.C. (Hausleitner
2006). A pre-recorded male Western Screech-Owl territorial call was broadcast at each station
using a compact disk player and a 15 watt Nexxtech megaphone. Calls were broadcast for a 1
minute duration followed by 4 minutes of listening for responding owls. A total of three, 1
minute calls were conducted at each station for a total survey effort of 15 minutes. If an owl was
detected during the survey, calling was stopped and data was collected. All surveys were
conducted after sunset and before sunrise, except when an attempt was made during the day to
obtain a more precise location of a previously detected owl. No spontaneous calling survey was
conducted prior to call-playback surveys.
Calling stations were placed at distances <500 m for areas where habitat was continuous and
deemed suitable for the occurrence of Western Screech-Owl. In areas where suitable habitat was
not continuous, stations were placed >500 m apart at sites deemed to contain suitable habitat by
surveyors.
Two data forms were used to record field observations during call-playback surveys: an owl
survey and owl detection form (Appendix 1 and 2). If no owl was detected during a call-
playback survey a “null detection” was recorded. A Garmin GPSmap 60CX was used to obtain
Universal Trans Mercator co-ordinates (i.e., Easting and Northing) for call-playback stations
and to project the location of detected owls via an approximated bearing and distance to their
first initial calling location. Data from field forms was entered using Microsoft Excel into an
owl call-playback and nest survey data template obtained through the B.C. Ministry of
Environment’s Wildlife Species Inventory program (B.C. Ministry of Environment 2006). All
data was submitted to John Surgenor, B.C. Ministry of Environment Regional Species at Risk
Biologist, and the B.C. Species Inventory Data System.
4 RESULTS
4.1 Survey Effort
A total of 24 nights of surveys were conducted in 2007 on the following dates: 13 and 18 April;
5 - 7 and 17 - 20 May; 3 June; 27 - 31 July; 1 and 8 August; and 4 - 10 September. The total
number of call-playback surveys conducted for Western Screech-Owl was 231. Three Western
Screech-Owls were detected during these surveys resulting in a detection rate of 1.3%. Surveys
targeted suitable habitat over a wide geographical area within the Thompson Region (Figure 3).
All stations were surveyed for a duration of 15 minutes, except for two, which were surveyed
for 20 and 30 minutes in an attempt to re-detect a recently detected Western Screech-Owl. Total
survey time for 2007 was 3,485 minutes.
5
Figure 3. Locations of 2007 call-playback survey stations in the Thompson Region, B.C.
(Stations indicated by grey squares) (Government of B.C. 2007b).
4.2 New Detections and Resightings of Western Screech-Owls
A total of two new Western Screech-Owl detections were made in 2007 (Figure 4 and Appendix
3).
A new Western Screech-Owl was acoustically detected for a 1 minute period during the evening
of 28 July along the lower portion of Criss Creek (Figure 5). On 29 July, two attempts were
made to redetect and pinpoint this owl’s location, one during the day and one at night, but no
response was obtained. An additional call-playback survey was conducted in the area on 8
August, but no owls were detected.
A new Western Screech-Owl was acoustically detected at two adjacent call-playback survey
stations on 4 September along the upper Coldwater River (Figure 6). At both stations, the owl
moved in from over 150 meters away to as close as 40 meters. The owl was detected on two
properties: 'The Ranch' at 345 Coldwater Road and 249 Coldwater Road. A daytime site visit on
the 22 September suggests the owl may reside within a core patch of mixed coniferous and
deciduous trees, with black cottonwood representing the leading tree species. This riparian
habitat occurs within the Ponderosa Pine very, dry hot variant 2 subzone and resembles the Red
listed black cottonwood and water birch (Betula occidentalis) ecological community (B.C.
6
Conservation Date Centre 2003). Although a call-playback survey was conducted at the site
(i.e., Z10 656759 5548247, NAD 83), no owls were detected.
Of the surveys conducted to re-detect three Western Screech-Owls found in 2006 and one found
in the spring of 2007, only one re-detection was made in 2007.
A Western Screech-Owl originally detected along the upper Deadman River on 5 June 2006 was
re-detected by spontaneous calling on 3 June, re-detected visually on 4 June and re-detected
acoustically on 8 August (Appendix 3).
A single call-playback survey was conducted along the lower Nicola River (i.e., Dot Ranch
Cutoff Road) on 18 April to re-detect a Western Screech-Owl heard in the area during mid May
and June of 2006. However, no detection of the owl was made. An additional six call-playback
surveys were conducted in the area on 5 September, but no owls were detected.
Six call-playback surveys were conducted along the Deadman-Cache Creek Road (i.e., Back
Valley area) on the night of 31 July to re-detect a Western Screech-Owl heard on 20 June 2006,
but no Western Screech-Owls were detected.
Four call-playback surveys were conducted along the lower reaches of Tranquille Creek on 4
April to re-detect a Western Screech-Owl heard and seen by local naturalists in the area during
the spring of 2007. However, no detection of the owl was made.
Figure 4. Locations of 2007 Western Screech-Owl detections in the Thompson Region, B.C.
(Detections indicated by black squares) (Government of B.C. 2007b).
7
Figure 5. Habitat along lower Criss Creek where Western Screech-Owl detection was made.
Figure 6. Habitat along upper Coldwater River where Western Screech-Owl detection was
made.
8
4.3 Other Owl Species Detections and Observations
During call-playback surveys for Western Screech-Owl the following owl species were
detected: Great Horned Owl (n = 15), Northern Pygmy Owl (n = 1), Northern Saw-whet Owl (n
= 1) and an unknown owl species (n = 1) (Appendix 4). In addition to these detections, 5 Great
Horned Owls were visually detected while driving between call-playback stations along
Douglas Lake Road on 9 September. One Barred and Northern Pygmy Owl were also visually
detected in the early evening along Monte Creek on 10 September.
Two areas of burned, deciduous riparian forest habitat were noted during surveys. The first area
was believed to be on the Upper Hat Creek Indian Reserve along Highway 99 and the second
site was in the lower Nicola Valley along Highway 8 near Dot Ranch (Figure 7).
Figure 7. Burned deciduous riparian forest habitat within the Lower Nicola Valley.
5 DISCUSSION
Given three separate detections were made of a Western Screech-Owl along the upper Deadman
River in 2007 and it was first detected in June of 2006, it is presumed that this is a resident owl
to the area. However, the breeding status of this owl is still undetermined, as a female owl and
juveniles have never been detected at the site. This area is currently protected by a 53 hectare
Wildlife Habitat Area, which was established on 8 May 2007.
Given a detection rate of only 1.3% was achieved during call-playback surveys for Western
Screech-Owl in 2007, this further lends evidence to the rarity of this species in the Thompson
Region. It also highlights the northern range of this subspecies in B.C.
9
Possible reasons for the lack of re-detections of Western Screech-Owls found in 2006 along the
Deadman-Cache Creek Road and Dot Ranch Cutoff Road, in addition to the owl detected once
along lower Criss Creek in 2007, may have been the result of the owls moving to another area
outside the radius of our calling stations or a lack of response to call-playbacks during the time
of survey. It should be noted that the riparian area along the lower sections of Criss Creek was
narrow and had limited mature deciduous forest and shrub cover, which is preferred habitat for
the Western Screech-Owl (Rodriguez-Estrella and Careaga 2003).
6 RECOMMENDATIONS
The authors recommend that more detailed surveys be carried out in the upper Deadman River
to assess the breeding status of the Western Screech-Owl that has been detected in the area four
times over a two year period. This could involve visual searches for the following features:
additional owls in the area to determine pair status; owl sign, such as whitewash, pellets, feathers
and prey remains; nesting sites; and nestlings or fledglings to determine breeding and
productivity.
The authors recommend that Western Screech-Owls detected along lower Criss Creek, upper
Coldwater River and detections from 2006, such as those along Deadman-Cache Creek Road
and Dot Ranch Cutoff Road, be resurveyed at different times during the breeding season (e.g.,
once every month) to greater assess the presence/not detected status of owls in these areas. This
is important, given the rarity of this species in the region, the possibility of detecting offspring
from previous years that may have established territories in the surrounding area and the more
efficient use of time obtained by targeting previously known areas of occurrence. A caveat to
this recommendation is that owls previously detected may be temporary residents of the area
and therefore may move unknown distances beyond the last known detection site. To help
account for this, it is recommended that a series of call-playback stations be conducted around
or along the corridor of the last known detection site for the owl.
The authors recommend incorporating stewardship activities as a tool to increase public
awareness regarding the links between Western Screech-Owls and riparian forests.
Although situated on private property, the Coldwater detection should be assessed by the MOE
for the possibility of capturing suitable habitat on Crown Land as an established Wildlife
Habitat Area under the IWMS. The contacted landowner, John R.Boys, was receptive to the
conservation of habitat for wildlife on their property, thus there may exist the possibility of
protecting habitat in this area through other means (e.g., conservation covenant). A follow up
survey in the spring of 2008 is recommended to reassess the status of this site for Western
Screech-Owls.
10
7 LITERATURE CITED
B.C. Conservation Data Centre. 2003. [Populus balsamifera ssp. trichocarpa / Betula
occidentalis Black cottonwood / water birch]. Plant community account summary
[C1B3DPBBO1]. B.C. Ministry of Sustainable Resource Management, Victoria, B.C. 1pp.
B.C. Conservation Data Centre. 2007. Species summary: Megascops kennicottii macfarlanei.
B.C. Ministry of Environment. Available: http://srmapps.gov.bc.ca/apps/eswp/
(Accessed 17 September 2007).
B.C. Ministry of Environment. 2006. Wildlife species inventory program. Available:
http://srmwww.gov.bc.ca/wildlife/wsi/index.htm (Accessed 17 September 2007).
Campbell, R.W., N.K. Dawe, I. McTaggart-Cowan, J.M. Cooper, G.W. Kaiser and M.C.E.
McNall. 1990. The birds of British Columbia. Vol. II: Nonpasserines. Diurnal birds of
prey through woodpeckers. Royal B.C. Museum, Victoria, B.C., and Canadian Wildlife
Service, Delta, B.C.
Canadian Wildlife Service. 2004. Species account for the Western Screech-Owl macfarlanei
subspecies. Available: http://www.speciesatrisk.gc.ca (Accessed 18 September 2007).
Cannings, R.A., R.J. Cannings and S.G. Cannings. 1987. Birds of the Okanagan valley, British
Columbia. Royal B.C. Museum, Victoria, B.C. 420pp.
COSEWIC. 2002. COSEWIC assessment and update status report on the Western Screech-Owl
otus kennicottii in Canada. Committee on the Status of Endangered Wildlife in Canada.
Ottawa. 31pp.
Government of B.C. 2007a. B.C. species and ecosystems explorer. B.C. Ministry of
Environment. Available: http://srmapps.gov.bc.ca/apps/eswp/ (Accessed 17 September
2007).
Government of B.C. 2007b. iMapBC. Integrated Land Management Bureau. Available:
http://ilmbwww.gov.bc.ca/ (Accessed 17 September 2007).
Hausleitner, D. 2006. Inventory methods for owl surveys. Standards for Components of B.C.'s
Biodiversity No. 42. Ecosystems Branch of the B.C. Ministry of Environment for the
Resources Information Standards Committee.
Iredale, F. 2007. Western Screech-Owl habitat suitability model for the Thompson Region.
Unpublished map. B.C. Ministry of Environment, Kamloops, B.C.
Rodriguez-Estrella, R. and A.P. Careaga. 2003. The Western Screech-Owl and habitat alteration
in Baja California: a gradient from urban and rural landcapes to natural habitat. Canadian
Journal of Zoology (81): 916-922.
11
Appen
dix
1:
Aco
ust
ic c
all-
pla
yb
ack o
wl
surv
ey d
ata
form
.
Ow
l S
urv
ey F
orm
(_________________)
Su
rvey
(ro
ute
) N
am
e ____________________________________ O
bse
rver
(s)_
_________________________ D
ay _
__ M
on
th _
__ Y
ear_
_____
Wea
ther
Con
dit
ion
s at
Sta
rt o
f S
urv
ey:
S
tart
Tim
e___________ T
ime
Of
Su
nse
t____________ T
OT
AL
SU
RV
EY
MIN
UT
ES
_________
Tem
p._
___
oC
W
ind (
circ
le o
ne)
0 1 2 3 4 5 C
loud C
over
(ci
rcle
one)
Cle
ar <
50%
>
50%
100%
Pre
cip
itati
on:
None
Lig
ht
Rai
n M
od. R
ain H
eavy R
ain
Sta
tion
#
Z
East
ing
Nort
hin
g
Sta
rt
Tim
e E
nd
Tim
e S
ps
Cod
e F
orm
#
Sta
tion
Com
men
ts
Wea
ther
Con
dit
ion
s at
EN
D o
f S
urv
ey:
E
nd T
ime_
________
Tem
p._
___
oC
W
ind (
circ
le o
ne)
0 1 2 3 4 5 C
loud C
over
(ci
rcle
one)
Cle
ar <
50%
>
50%
100%
Pre
cip
itati
on:
None
Lig
ht
Rai
n M
od. R
ain H
eavy R
ain
12
Appen
dix
2:
Aco
ust
ic c
all-
pla
yb
ack o
wl
det
ecti
on d
ata
form
.
O
wl
Det
ecti
on
Form
(_____________________)
FO
RM
#:
_____
Su
rvey
(R
ou
te)
Nam
e ______________________________ O
bse
rver
(s)
_________________________________
Day _
__ M
on
th _
___ Y
ear_
_________ S
tart
Tim
e: _
___________ S
un
set
At:
________
Sta
tion
#
Sp
ecie
s
Cod
e
Call
Tim
e
Res
pon
se
Tim
e
Call
Du
rati
on
Call
Typ
e
Vis
ual/
Aco
ust
ic
Dir
ecti
on
of
Call
Dis
tan
ce t
o
Ow
l
Pro
ject
ed
UT
M
AC
/
Sex
Com
men
ts /
Ow
l
Movem
ent
Data
Def
init
ion
s:
Cal
l T
ime:
tim
e of
firs
t det
ecte
d r
esponse
(m
ilit
ary t
ime)
.
Res
ponse
Tim
e: t
ime
(min
ute
s) e
lapse
d b
etw
een s
tati
on s
tart
tim
e (f
irst
cal
l) a
nd f
irst
det
ecte
d r
esponse
fro
m o
wl.
Cal
l D
ura
tion:
Dura
tion (
min
ute
s) o
f ow
l voca
liza
tion.
Cal
l T
ype:
Iden
tify
the
voca
liza
tions
of
the
resp
ondin
g o
wl
(Ter
rito
ry, R
ack C
all,
Co
-wee
p, C
ooin
g, 4-n
ote
, S
erie
s ca
ll, B
arkin
g C
all,
Copula
tion C
all)
Vis
ual
/Aco
ust
ic:
Iden
tify
if
the
ow
l w
as a
ctual
ly s
een o
r ju
st h
eard
.
Dir
ecti
on o
f C
all:
Pro
vid
e th
e bea
ring (
in d
egre
es)
of
the
dir
ecti
on o
f th
e re
spondin
g o
wl,
rel
ativ
e to
the
surv
ey s
tati
on.
Dis
tance
to O
wl:
Pro
vid
e th
e es
tim
ated
dis
tance
(in
met
ers)
fro
m t
he
stat
ion t
o t
he
call
ing o
wl.
Pro
ject
ed U
TM
: P
rovid
e th
e N
AD
83 U
TM
(Z
/E/N
) fo
r th
e pro
ject
ed c
oord
inat
e of
the
ow
ls e
stim
ated
loca
tion (
bas
ed o
n d
ista
nce
and b
eari
ng)
Age
Cla
ss /
Sex
: Id
enti
fy t
he
ow
l (b
ased
on c
all
type)
as
adult
or
juven
ile
and i
den
tify
sex
(w
hen
cer
tain
) as
mal
e or
fem
ale.
Ow
l M
ovem
ents
: re
cord
com
men
ts o
n t
he
ow
ls m
ovem
ents
, re
lati
ve
to t
he
stat
ion, fo
r th
e dura
tion o
f th
e ow
ls r
esponse
act
ivit
y.
13
Appendix 3. Western Screech-Owl detections in the Thompson Region, B.C.
Area
Date (yy-mm-dd)
Count
Sex
Projected UTM (NAD 83)
Upper Deadman River
2007-06-03
1
Male
Z10 645662 5652094
Criss Creek 2007-07-28 1 Male Z10 644076 5639900
Upper Deadman River 2007-08-08 1 Male Z10 645682 5651987
Coldwater River 2007-09-04 1 Male Z10 656972 5548250
Appendix 4: Detection of other owl species in the Thompson Region, B.C.
Area
Date (yy-mm-dd)
Species
Count
Sex
Projected UTM (NAD 83)
Hat Creek
2007-05-05
B-GHOW
1
UNK
Z10 608402 5611516
Hat Creek 2007-05-06 B-GHOW 1 Male Z10 599823 5630115
Monte Creek FSR 2007-05-20 B-NPOW 1 Male Z11 295779 5595501
Upper Deadman River 2007-07-09 UNK 1 UNK NA
Battle Creek 2007-07-09 B-NSWO 1 Male Z10 632056 5636143
Back Valley 2007-07-31 B-GHOW 1 Male Z10 624712 5633680
Back Valley 2007-07-31 B-GHOW 1 Male Z10 625040 5633791
Coldwater River 2007-09-04 B-GHOW 1 UNK Z10 648859 5539634
Coldwater River 2007-09-04 B-GHOW 1 UNK Z10 651179 5540055
Skuhun FSR 2007-09-06 B-GHOW 1 UNK Z10 640780 5576257
Skuhun FSR 2007-09-06 B-GHOW 1 UNK Z10 636201 5572924
Skuhun FSR 2007-09-06 B-GHOW 1 UNK Z10 635912 5573289
Mill Creek 2007-09-07 B-GHOW 1 UNK Z10 668515 5565023
Quilchena Creek 2007-09-08 B-GHOW 1 UNK Z10 678466 5556502
Quilchena Creek 2007-09-08 B-GHOW 1 UNK Z10 679017 5556771
Douglas Lake Road 2007-09-09 B-GHOW 1 UNK Z10 704307 5561068
Douglas Lake Road 2007-09-09 B-GHOW 1 UNK Z10 702522 5560299
Douglas Lake Road 2007-09-09 B-GHOW 1 UNK Z10 687402 5561810